http://es.wikipedia.org/wiki/Hugo_Butler

Roll, Philip Ansell

Addis, H.B.

Mozo, Hugo

Film Index International, 1997---(Hugo Butler ; b. 1914, d. 1968 ; author, scripting, direction)

Internet movie database, 16-07-2003---(Hugo Butler; b. 1914, Calgary, Alberta (Canada), d. 1968, Hollywood, California; sometimes credited as H.B. Addis, Hugo Mozo, Philip Ansell Roll; writer)